Coil on plug boot question. 5.4 modular
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Coil on plug boot question. 5.4 modular
I replaced all my plugs and boots on a 1998 Ford E-250 5.4 engine. My new boots from Auto Zone do not seal tight at the top of the spark plug well. Is this normal?
I had discarded the original ones days before but I remember them fitting tight and not allowing the COP to rotate. I am now getting a misfire on #6 cylinder when it is raining or very damp. I used dielectric grease at the coil and plug end of the boots. Should I have gotten the boots from Ford for a tight fit? Thanks for any help or advice.
I had discarded the original ones days before but I remember them fitting tight and not allowing the COP to rotate. I am now getting a misfire on #6 cylinder when it is raining or very damp. I used dielectric grease at the coil and plug end of the boots. Should I have gotten the boots from Ford for a tight fit? Thanks for any help or advice.
Moderator
Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Welcome to the forum 
I've never heard of any problems with the aftermarket boots. I would remove it and regrease it real good to see if that cures the problem.
You might also pull that plug and make sure that the porcelin isn't cracked.
I've never heard of any problems with the aftermarket boots. I would remove it and regrease it real good to see if that cures the problem.
You might also pull that plug and make sure that the porcelin isn't cracked.
Freshman User
Joined: Aug 2006
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i had the exact problem on my 99 5.4-could not get the dang things to seal and misfires on 2 and 5. i ended up getting factory boots on the motor 2 weeks later.
fixed the problem.
aftermarket parts from china!
factory parts from canada.
fixed the problem.
aftermarket parts from china!
factory parts from canada.
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wchain
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